1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2001 Ben. Herrenschmidt (benh@kernel.crashing.org) 4 * 5 * Modifications for ppc64: 6 * Copyright (C) 2003 Dave Engebretsen <engebret@us.ibm.com> 7 * 8 * Copyright 2008 Michael Ellerman, IBM Corporation. 9 */ 10 11 #include <linux/types.h> 12 #include <linux/jump_label.h> 13 #include <linux/kernel.h> 14 #include <linux/string.h> 15 #include <linux/init.h> 16 #include <linux/sched/mm.h> 17 #include <asm/cputable.h> 18 #include <asm/code-patching.h> 19 #include <asm/page.h> 20 #include <asm/sections.h> 21 #include <asm/setup.h> 22 #include <asm/security_features.h> 23 #include <asm/firmware.h> 24 25 struct fixup_entry { 26 unsigned long mask; 27 unsigned long value; 28 long start_off; 29 long end_off; 30 long alt_start_off; 31 long alt_end_off; 32 }; 33 34 static unsigned int *calc_addr(struct fixup_entry *fcur, long offset) 35 { 36 /* 37 * We store the offset to the code as a negative offset from 38 * the start of the alt_entry, to support the VDSO. This 39 * routine converts that back into an actual address. 40 */ 41 return (unsigned int *)((unsigned long)fcur + offset); 42 } 43 44 static int patch_alt_instruction(unsigned int *src, unsigned int *dest, 45 unsigned int *alt_start, unsigned int *alt_end) 46 { 47 unsigned int instr; 48 49 instr = *src; 50 51 if (instr_is_relative_branch(*src)) { 52 unsigned int *target = (unsigned int *)branch_target(src); 53 54 /* Branch within the section doesn't need translating */ 55 if (target < alt_start || target > alt_end) { 56 instr = translate_branch(dest, src); 57 if (!instr) 58 return 1; 59 } 60 } 61 62 raw_patch_instruction(dest, instr); 63 64 return 0; 65 } 66 67 static int patch_feature_section(unsigned long value, struct fixup_entry *fcur) 68 { 69 unsigned int *start, *end, *alt_start, *alt_end, *src, *dest; 70 71 start = calc_addr(fcur, fcur->start_off); 72 end = calc_addr(fcur, fcur->end_off); 73 alt_start = calc_addr(fcur, fcur->alt_start_off); 74 alt_end = calc_addr(fcur, fcur->alt_end_off); 75 76 if ((alt_end - alt_start) > (end - start)) 77 return 1; 78 79 if ((value & fcur->mask) == fcur->value) 80 return 0; 81 82 src = alt_start; 83 dest = start; 84 85 for (; src < alt_end; src++, dest++) { 86 if (patch_alt_instruction(src, dest, alt_start, alt_end)) 87 return 1; 88 } 89 90 for (; dest < end; dest++) 91 raw_patch_instruction(dest, PPC_INST_NOP); 92 93 return 0; 94 } 95 96 void do_feature_fixups(unsigned long value, void *fixup_start, void *fixup_end) 97 { 98 struct fixup_entry *fcur, *fend; 99 100 fcur = fixup_start; 101 fend = fixup_end; 102 103 for (; fcur < fend; fcur++) { 104 if (patch_feature_section(value, fcur)) { 105 WARN_ON(1); 106 printk("Unable to patch feature section at %p - %p" \ 107 " with %p - %p\n", 108 calc_addr(fcur, fcur->start_off), 109 calc_addr(fcur, fcur->end_off), 110 calc_addr(fcur, fcur->alt_start_off), 111 calc_addr(fcur, fcur->alt_end_off)); 112 } 113 } 114 } 115 116 #ifdef CONFIG_PPC_BOOK3S_64 117 static void do_stf_entry_barrier_fixups(enum stf_barrier_type types) 118 { 119 unsigned int instrs[3], *dest; 120 long *start, *end; 121 int i; 122 123 start = PTRRELOC(&__start___stf_entry_barrier_fixup), 124 end = PTRRELOC(&__stop___stf_entry_barrier_fixup); 125 126 instrs[0] = 0x60000000; /* nop */ 127 instrs[1] = 0x60000000; /* nop */ 128 instrs[2] = 0x60000000; /* nop */ 129 130 i = 0; 131 if (types & STF_BARRIER_FALLBACK) { 132 instrs[i++] = 0x7d4802a6; /* mflr r10 */ 133 instrs[i++] = 0x60000000; /* branch patched below */ 134 instrs[i++] = 0x7d4803a6; /* mtlr r10 */ 135 } else if (types & STF_BARRIER_EIEIO) { 136 instrs[i++] = 0x7e0006ac; /* eieio + bit 6 hint */ 137 } else if (types & STF_BARRIER_SYNC_ORI) { 138 instrs[i++] = 0x7c0004ac; /* hwsync */ 139 instrs[i++] = 0xe94d0000; /* ld r10,0(r13) */ 140 instrs[i++] = 0x63ff0000; /* ori 31,31,0 speculation barrier */ 141 } 142 143 for (i = 0; start < end; start++, i++) { 144 dest = (void *)start + *start; 145 146 pr_devel("patching dest %lx\n", (unsigned long)dest); 147 148 patch_instruction(dest, instrs[0]); 149 150 if (types & STF_BARRIER_FALLBACK) 151 patch_branch(dest + 1, (unsigned long)&stf_barrier_fallback, 152 BRANCH_SET_LINK); 153 else 154 patch_instruction(dest + 1, instrs[1]); 155 156 patch_instruction(dest + 2, instrs[2]); 157 } 158 159 printk(KERN_DEBUG "stf-barrier: patched %d entry locations (%s barrier)\n", i, 160 (types == STF_BARRIER_NONE) ? "no" : 161 (types == STF_BARRIER_FALLBACK) ? "fallback" : 162 (types == STF_BARRIER_EIEIO) ? "eieio" : 163 (types == (STF_BARRIER_SYNC_ORI)) ? "hwsync" 164 : "unknown"); 165 } 166 167 static void do_stf_exit_barrier_fixups(enum stf_barrier_type types) 168 { 169 unsigned int instrs[6], *dest; 170 long *start, *end; 171 int i; 172 173 start = PTRRELOC(&__start___stf_exit_barrier_fixup), 174 end = PTRRELOC(&__stop___stf_exit_barrier_fixup); 175 176 instrs[0] = 0x60000000; /* nop */ 177 instrs[1] = 0x60000000; /* nop */ 178 instrs[2] = 0x60000000; /* nop */ 179 instrs[3] = 0x60000000; /* nop */ 180 instrs[4] = 0x60000000; /* nop */ 181 instrs[5] = 0x60000000; /* nop */ 182 183 i = 0; 184 if (types & STF_BARRIER_FALLBACK || types & STF_BARRIER_SYNC_ORI) { 185 if (cpu_has_feature(CPU_FTR_HVMODE)) { 186 instrs[i++] = 0x7db14ba6; /* mtspr 0x131, r13 (HSPRG1) */ 187 instrs[i++] = 0x7db04aa6; /* mfspr r13, 0x130 (HSPRG0) */ 188 } else { 189 instrs[i++] = 0x7db243a6; /* mtsprg 2,r13 */ 190 instrs[i++] = 0x7db142a6; /* mfsprg r13,1 */ 191 } 192 instrs[i++] = 0x7c0004ac; /* hwsync */ 193 instrs[i++] = 0xe9ad0000; /* ld r13,0(r13) */ 194 instrs[i++] = 0x63ff0000; /* ori 31,31,0 speculation barrier */ 195 if (cpu_has_feature(CPU_FTR_HVMODE)) { 196 instrs[i++] = 0x7db14aa6; /* mfspr r13, 0x131 (HSPRG1) */ 197 } else { 198 instrs[i++] = 0x7db242a6; /* mfsprg r13,2 */ 199 } 200 } else if (types & STF_BARRIER_EIEIO) { 201 instrs[i++] = 0x7e0006ac; /* eieio + bit 6 hint */ 202 } 203 204 for (i = 0; start < end; start++, i++) { 205 dest = (void *)start + *start; 206 207 pr_devel("patching dest %lx\n", (unsigned long)dest); 208 209 patch_instruction(dest, instrs[0]); 210 patch_instruction(dest + 1, instrs[1]); 211 patch_instruction(dest + 2, instrs[2]); 212 patch_instruction(dest + 3, instrs[3]); 213 patch_instruction(dest + 4, instrs[4]); 214 patch_instruction(dest + 5, instrs[5]); 215 } 216 printk(KERN_DEBUG "stf-barrier: patched %d exit locations (%s barrier)\n", i, 217 (types == STF_BARRIER_NONE) ? "no" : 218 (types == STF_BARRIER_FALLBACK) ? "fallback" : 219 (types == STF_BARRIER_EIEIO) ? "eieio" : 220 (types == (STF_BARRIER_SYNC_ORI)) ? "hwsync" 221 : "unknown"); 222 } 223 224 225 void do_stf_barrier_fixups(enum stf_barrier_type types) 226 { 227 do_stf_entry_barrier_fixups(types); 228 do_stf_exit_barrier_fixups(types); 229 } 230 231 void do_rfi_flush_fixups(enum l1d_flush_type types) 232 { 233 unsigned int instrs[3], *dest; 234 long *start, *end; 235 int i; 236 237 start = PTRRELOC(&__start___rfi_flush_fixup), 238 end = PTRRELOC(&__stop___rfi_flush_fixup); 239 240 instrs[0] = 0x60000000; /* nop */ 241 instrs[1] = 0x60000000; /* nop */ 242 instrs[2] = 0x60000000; /* nop */ 243 244 if (types & L1D_FLUSH_FALLBACK) 245 /* b .+16 to fallback flush */ 246 instrs[0] = 0x48000010; 247 248 i = 0; 249 if (types & L1D_FLUSH_ORI) { 250 instrs[i++] = 0x63ff0000; /* ori 31,31,0 speculation barrier */ 251 instrs[i++] = 0x63de0000; /* ori 30,30,0 L1d flush*/ 252 } 253 254 if (types & L1D_FLUSH_MTTRIG) 255 instrs[i++] = 0x7c12dba6; /* mtspr TRIG2,r0 (SPR #882) */ 256 257 for (i = 0; start < end; start++, i++) { 258 dest = (void *)start + *start; 259 260 pr_devel("patching dest %lx\n", (unsigned long)dest); 261 262 patch_instruction(dest, instrs[0]); 263 patch_instruction(dest + 1, instrs[1]); 264 patch_instruction(dest + 2, instrs[2]); 265 } 266 267 printk(KERN_DEBUG "rfi-flush: patched %d locations (%s flush)\n", i, 268 (types == L1D_FLUSH_NONE) ? "no" : 269 (types == L1D_FLUSH_FALLBACK) ? "fallback displacement" : 270 (types & L1D_FLUSH_ORI) ? (types & L1D_FLUSH_MTTRIG) 271 ? "ori+mttrig type" 272 : "ori type" : 273 (types & L1D_FLUSH_MTTRIG) ? "mttrig type" 274 : "unknown"); 275 } 276 277 void do_barrier_nospec_fixups_range(bool enable, void *fixup_start, void *fixup_end) 278 { 279 unsigned int instr, *dest; 280 long *start, *end; 281 int i; 282 283 start = fixup_start; 284 end = fixup_end; 285 286 instr = 0x60000000; /* nop */ 287 288 if (enable) { 289 pr_info("barrier-nospec: using ORI speculation barrier\n"); 290 instr = 0x63ff0000; /* ori 31,31,0 speculation barrier */ 291 } 292 293 for (i = 0; start < end; start++, i++) { 294 dest = (void *)start + *start; 295 296 pr_devel("patching dest %lx\n", (unsigned long)dest); 297 patch_instruction(dest, instr); 298 } 299 300 printk(KERN_DEBUG "barrier-nospec: patched %d locations\n", i); 301 } 302 303 #endif /* CONFIG_PPC_BOOK3S_64 */ 304 305 #ifdef CONFIG_PPC_BARRIER_NOSPEC 306 void do_barrier_nospec_fixups(bool enable) 307 { 308 void *start, *end; 309 310 start = PTRRELOC(&__start___barrier_nospec_fixup), 311 end = PTRRELOC(&__stop___barrier_nospec_fixup); 312 313 do_barrier_nospec_fixups_range(enable, start, end); 314 } 315 #endif /* CONFIG_PPC_BARRIER_NOSPEC */ 316 317 #ifdef CONFIG_PPC_FSL_BOOK3E 318 void do_barrier_nospec_fixups_range(bool enable, void *fixup_start, void *fixup_end) 319 { 320 unsigned int instr[2], *dest; 321 long *start, *end; 322 int i; 323 324 start = fixup_start; 325 end = fixup_end; 326 327 instr[0] = PPC_INST_NOP; 328 instr[1] = PPC_INST_NOP; 329 330 if (enable) { 331 pr_info("barrier-nospec: using isync; sync as speculation barrier\n"); 332 instr[0] = PPC_INST_ISYNC; 333 instr[1] = PPC_INST_SYNC; 334 } 335 336 for (i = 0; start < end; start++, i++) { 337 dest = (void *)start + *start; 338 339 pr_devel("patching dest %lx\n", (unsigned long)dest); 340 patch_instruction(dest, instr[0]); 341 patch_instruction(dest + 1, instr[1]); 342 } 343 344 printk(KERN_DEBUG "barrier-nospec: patched %d locations\n", i); 345 } 346 347 static void patch_btb_flush_section(long *curr) 348 { 349 unsigned int *start, *end; 350 351 start = (void *)curr + *curr; 352 end = (void *)curr + *(curr + 1); 353 for (; start < end; start++) { 354 pr_devel("patching dest %lx\n", (unsigned long)start); 355 patch_instruction(start, PPC_INST_NOP); 356 } 357 } 358 359 void do_btb_flush_fixups(void) 360 { 361 long *start, *end; 362 363 start = PTRRELOC(&__start__btb_flush_fixup); 364 end = PTRRELOC(&__stop__btb_flush_fixup); 365 366 for (; start < end; start += 2) 367 patch_btb_flush_section(start); 368 } 369 #endif /* CONFIG_PPC_FSL_BOOK3E */ 370 371 void do_lwsync_fixups(unsigned long value, void *fixup_start, void *fixup_end) 372 { 373 long *start, *end; 374 unsigned int *dest; 375 376 if (!(value & CPU_FTR_LWSYNC)) 377 return ; 378 379 start = fixup_start; 380 end = fixup_end; 381 382 for (; start < end; start++) { 383 dest = (void *)start + *start; 384 raw_patch_instruction(dest, PPC_INST_LWSYNC); 385 } 386 } 387 388 static void do_final_fixups(void) 389 { 390 #if defined(CONFIG_PPC64) && defined(CONFIG_RELOCATABLE) 391 int *src, *dest; 392 unsigned long length; 393 394 if (PHYSICAL_START == 0) 395 return; 396 397 src = (int *)(KERNELBASE + PHYSICAL_START); 398 dest = (int *)KERNELBASE; 399 length = (__end_interrupts - _stext) / sizeof(int); 400 401 while (length--) { 402 raw_patch_instruction(dest, *src); 403 src++; 404 dest++; 405 } 406 #endif 407 } 408 409 static unsigned long __initdata saved_cpu_features; 410 static unsigned int __initdata saved_mmu_features; 411 #ifdef CONFIG_PPC64 412 static unsigned long __initdata saved_firmware_features; 413 #endif 414 415 void __init apply_feature_fixups(void) 416 { 417 struct cpu_spec *spec = PTRRELOC(*PTRRELOC(&cur_cpu_spec)); 418 419 *PTRRELOC(&saved_cpu_features) = spec->cpu_features; 420 *PTRRELOC(&saved_mmu_features) = spec->mmu_features; 421 422 /* 423 * Apply the CPU-specific and firmware specific fixups to kernel text 424 * (nop out sections not relevant to this CPU or this firmware). 425 */ 426 do_feature_fixups(spec->cpu_features, 427 PTRRELOC(&__start___ftr_fixup), 428 PTRRELOC(&__stop___ftr_fixup)); 429 430 do_feature_fixups(spec->mmu_features, 431 PTRRELOC(&__start___mmu_ftr_fixup), 432 PTRRELOC(&__stop___mmu_ftr_fixup)); 433 434 do_lwsync_fixups(spec->cpu_features, 435 PTRRELOC(&__start___lwsync_fixup), 436 PTRRELOC(&__stop___lwsync_fixup)); 437 438 #ifdef CONFIG_PPC64 439 saved_firmware_features = powerpc_firmware_features; 440 do_feature_fixups(powerpc_firmware_features, 441 &__start___fw_ftr_fixup, &__stop___fw_ftr_fixup); 442 #endif 443 do_final_fixups(); 444 } 445 446 void __init setup_feature_keys(void) 447 { 448 /* 449 * Initialise jump label. This causes all the cpu/mmu_has_feature() 450 * checks to take on their correct polarity based on the current set of 451 * CPU/MMU features. 452 */ 453 jump_label_init(); 454 cpu_feature_keys_init(); 455 mmu_feature_keys_init(); 456 } 457 458 static int __init check_features(void) 459 { 460 WARN(saved_cpu_features != cur_cpu_spec->cpu_features, 461 "CPU features changed after feature patching!\n"); 462 WARN(saved_mmu_features != cur_cpu_spec->mmu_features, 463 "MMU features changed after feature patching!\n"); 464 #ifdef CONFIG_PPC64 465 WARN(saved_firmware_features != powerpc_firmware_features, 466 "Firmware features changed after feature patching!\n"); 467 #endif 468 469 return 0; 470 } 471 late_initcall(check_features); 472 473 #ifdef CONFIG_FTR_FIXUP_SELFTEST 474 475 #define check(x) \ 476 if (!(x)) printk("feature-fixups: test failed at line %d\n", __LINE__); 477 478 /* This must be after the text it fixes up, vmlinux.lds.S enforces that atm */ 479 static struct fixup_entry fixup; 480 481 static long calc_offset(struct fixup_entry *entry, unsigned int *p) 482 { 483 return (unsigned long)p - (unsigned long)entry; 484 } 485 486 static void test_basic_patching(void) 487 { 488 extern unsigned int ftr_fixup_test1[]; 489 extern unsigned int end_ftr_fixup_test1[]; 490 extern unsigned int ftr_fixup_test1_orig[]; 491 extern unsigned int ftr_fixup_test1_expected[]; 492 int size = 4 * (end_ftr_fixup_test1 - ftr_fixup_test1); 493 494 fixup.value = fixup.mask = 8; 495 fixup.start_off = calc_offset(&fixup, ftr_fixup_test1 + 1); 496 fixup.end_off = calc_offset(&fixup, ftr_fixup_test1 + 2); 497 fixup.alt_start_off = fixup.alt_end_off = 0; 498 499 /* Sanity check */ 500 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_orig, size) == 0); 501 502 /* Check we don't patch if the value matches */ 503 patch_feature_section(8, &fixup); 504 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_orig, size) == 0); 505 506 /* Check we do patch if the value doesn't match */ 507 patch_feature_section(0, &fixup); 508 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_expected, size) == 0); 509 510 /* Check we do patch if the mask doesn't match */ 511 memcpy(ftr_fixup_test1, ftr_fixup_test1_orig, size); 512 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_orig, size) == 0); 513 patch_feature_section(~8, &fixup); 514 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_expected, size) == 0); 515 } 516 517 static void test_alternative_patching(void) 518 { 519 extern unsigned int ftr_fixup_test2[]; 520 extern unsigned int end_ftr_fixup_test2[]; 521 extern unsigned int ftr_fixup_test2_orig[]; 522 extern unsigned int ftr_fixup_test2_alt[]; 523 extern unsigned int ftr_fixup_test2_expected[]; 524 int size = 4 * (end_ftr_fixup_test2 - ftr_fixup_test2); 525 526 fixup.value = fixup.mask = 0xF; 527 fixup.start_off = calc_offset(&fixup, ftr_fixup_test2 + 1); 528 fixup.end_off = calc_offset(&fixup, ftr_fixup_test2 + 2); 529 fixup.alt_start_off = calc_offset(&fixup, ftr_fixup_test2_alt); 530 fixup.alt_end_off = calc_offset(&fixup, ftr_fixup_test2_alt + 1); 531 532 /* Sanity check */ 533 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_orig, size) == 0); 534 535 /* Check we don't patch if the value matches */ 536 patch_feature_section(0xF, &fixup); 537 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_orig, size) == 0); 538 539 /* Check we do patch if the value doesn't match */ 540 patch_feature_section(0, &fixup); 541 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_expected, size) == 0); 542 543 /* Check we do patch if the mask doesn't match */ 544 memcpy(ftr_fixup_test2, ftr_fixup_test2_orig, size); 545 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_orig, size) == 0); 546 patch_feature_section(~0xF, &fixup); 547 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_expected, size) == 0); 548 } 549 550 static void test_alternative_case_too_big(void) 551 { 552 extern unsigned int ftr_fixup_test3[]; 553 extern unsigned int end_ftr_fixup_test3[]; 554 extern unsigned int ftr_fixup_test3_orig[]; 555 extern unsigned int ftr_fixup_test3_alt[]; 556 int size = 4 * (end_ftr_fixup_test3 - ftr_fixup_test3); 557 558 fixup.value = fixup.mask = 0xC; 559 fixup.start_off = calc_offset(&fixup, ftr_fixup_test3 + 1); 560 fixup.end_off = calc_offset(&fixup, ftr_fixup_test3 + 2); 561 fixup.alt_start_off = calc_offset(&fixup, ftr_fixup_test3_alt); 562 fixup.alt_end_off = calc_offset(&fixup, ftr_fixup_test3_alt + 2); 563 564 /* Sanity check */ 565 check(memcmp(ftr_fixup_test3, ftr_fixup_test3_orig, size) == 0); 566 567 /* Expect nothing to be patched, and the error returned to us */ 568 check(patch_feature_section(0xF, &fixup) == 1); 569 check(memcmp(ftr_fixup_test3, ftr_fixup_test3_orig, size) == 0); 570 check(patch_feature_section(0, &fixup) == 1); 571 check(memcmp(ftr_fixup_test3, ftr_fixup_test3_orig, size) == 0); 572 check(patch_feature_section(~0xF, &fixup) == 1); 573 check(memcmp(ftr_fixup_test3, ftr_fixup_test3_orig, size) == 0); 574 } 575 576 static void test_alternative_case_too_small(void) 577 { 578 extern unsigned int ftr_fixup_test4[]; 579 extern unsigned int end_ftr_fixup_test4[]; 580 extern unsigned int ftr_fixup_test4_orig[]; 581 extern unsigned int ftr_fixup_test4_alt[]; 582 extern unsigned int ftr_fixup_test4_expected[]; 583 int size = 4 * (end_ftr_fixup_test4 - ftr_fixup_test4); 584 unsigned long flag; 585 586 /* Check a high-bit flag */ 587 flag = 1UL << ((sizeof(unsigned long) - 1) * 8); 588 fixup.value = fixup.mask = flag; 589 fixup.start_off = calc_offset(&fixup, ftr_fixup_test4 + 1); 590 fixup.end_off = calc_offset(&fixup, ftr_fixup_test4 + 5); 591 fixup.alt_start_off = calc_offset(&fixup, ftr_fixup_test4_alt); 592 fixup.alt_end_off = calc_offset(&fixup, ftr_fixup_test4_alt + 2); 593 594 /* Sanity check */ 595 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_orig, size) == 0); 596 597 /* Check we don't patch if the value matches */ 598 patch_feature_section(flag, &fixup); 599 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_orig, size) == 0); 600 601 /* Check we do patch if the value doesn't match */ 602 patch_feature_section(0, &fixup); 603 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_expected, size) == 0); 604 605 /* Check we do patch if the mask doesn't match */ 606 memcpy(ftr_fixup_test4, ftr_fixup_test4_orig, size); 607 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_orig, size) == 0); 608 patch_feature_section(~flag, &fixup); 609 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_expected, size) == 0); 610 } 611 612 static void test_alternative_case_with_branch(void) 613 { 614 extern unsigned int ftr_fixup_test5[]; 615 extern unsigned int end_ftr_fixup_test5[]; 616 extern unsigned int ftr_fixup_test5_expected[]; 617 int size = 4 * (end_ftr_fixup_test5 - ftr_fixup_test5); 618 619 check(memcmp(ftr_fixup_test5, ftr_fixup_test5_expected, size) == 0); 620 } 621 622 static void test_alternative_case_with_external_branch(void) 623 { 624 extern unsigned int ftr_fixup_test6[]; 625 extern unsigned int end_ftr_fixup_test6[]; 626 extern unsigned int ftr_fixup_test6_expected[]; 627 int size = 4 * (end_ftr_fixup_test6 - ftr_fixup_test6); 628 629 check(memcmp(ftr_fixup_test6, ftr_fixup_test6_expected, size) == 0); 630 } 631 632 static void test_alternative_case_with_branch_to_end(void) 633 { 634 extern unsigned int ftr_fixup_test7[]; 635 extern unsigned int end_ftr_fixup_test7[]; 636 extern unsigned int ftr_fixup_test7_expected[]; 637 int size = 4 * (end_ftr_fixup_test7 - ftr_fixup_test7); 638 639 check(memcmp(ftr_fixup_test7, ftr_fixup_test7_expected, size) == 0); 640 } 641 642 static void test_cpu_macros(void) 643 { 644 extern u8 ftr_fixup_test_FTR_macros[]; 645 extern u8 ftr_fixup_test_FTR_macros_expected[]; 646 unsigned long size = ftr_fixup_test_FTR_macros_expected - 647 ftr_fixup_test_FTR_macros; 648 649 /* The fixups have already been done for us during boot */ 650 check(memcmp(ftr_fixup_test_FTR_macros, 651 ftr_fixup_test_FTR_macros_expected, size) == 0); 652 } 653 654 static void test_fw_macros(void) 655 { 656 #ifdef CONFIG_PPC64 657 extern u8 ftr_fixup_test_FW_FTR_macros[]; 658 extern u8 ftr_fixup_test_FW_FTR_macros_expected[]; 659 unsigned long size = ftr_fixup_test_FW_FTR_macros_expected - 660 ftr_fixup_test_FW_FTR_macros; 661 662 /* The fixups have already been done for us during boot */ 663 check(memcmp(ftr_fixup_test_FW_FTR_macros, 664 ftr_fixup_test_FW_FTR_macros_expected, size) == 0); 665 #endif 666 } 667 668 static void test_lwsync_macros(void) 669 { 670 extern u8 lwsync_fixup_test[]; 671 extern u8 end_lwsync_fixup_test[]; 672 extern u8 lwsync_fixup_test_expected_LWSYNC[]; 673 extern u8 lwsync_fixup_test_expected_SYNC[]; 674 unsigned long size = end_lwsync_fixup_test - 675 lwsync_fixup_test; 676 677 /* The fixups have already been done for us during boot */ 678 if (cur_cpu_spec->cpu_features & CPU_FTR_LWSYNC) { 679 check(memcmp(lwsync_fixup_test, 680 lwsync_fixup_test_expected_LWSYNC, size) == 0); 681 } else { 682 check(memcmp(lwsync_fixup_test, 683 lwsync_fixup_test_expected_SYNC, size) == 0); 684 } 685 } 686 687 static int __init test_feature_fixups(void) 688 { 689 printk(KERN_DEBUG "Running feature fixup self-tests ...\n"); 690 691 test_basic_patching(); 692 test_alternative_patching(); 693 test_alternative_case_too_big(); 694 test_alternative_case_too_small(); 695 test_alternative_case_with_branch(); 696 test_alternative_case_with_external_branch(); 697 test_alternative_case_with_branch_to_end(); 698 test_cpu_macros(); 699 test_fw_macros(); 700 test_lwsync_macros(); 701 702 return 0; 703 } 704 late_initcall(test_feature_fixups); 705 706 #endif /* CONFIG_FTR_FIXUP_SELFTEST */ 707